.box_phone{
    height: 100px;
    width: 100%;
    border: 1px solid black;
    border-radius: 10%;
}
.banner_manage {
    height: 300px;
    width: 100%;
    padding: 10px 10px 10px 10px;
    border: 1px solid blue;
    position: relative;
    display: block;
}